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Under the influence of an electric field...

Under the influence of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using `NaCl, Na_2 SO_4, and Na_3 PO_4` solutions. Their coagulating values will be in the order

A

`NaCl gt Na_(2)S0_(4) gt Na_(3)P0_(4)`

B

`Na_(2)SO_(4) gt Na_(3)O_(4) gt NaCl`

C

`Na_(3)P0_(4) gt Na_(2)S0_(4) gt NaCl`

D

`Na_(2)SO_(4) gt NaCl gt Na_(3)P0_(4)`

Text Solution

Verified by Experts

The correct Answer is:
A
Since the sol particle migrate toward cathode, they are positively charged. Hence, anions would be effective in coagulation. Greater is the valence of effective ion, smaller will be its coagulating value.
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